Initial heat supply network station for waste heat utilization of coal-fired power plant

Abstract

The invention discloses a heat network first station for waste heat utilization in a coal-fired power plant, which includes a condenser and a heat substation. The condenser uses exhaust steam from a high back pressure steam turbine to heat circulating water, and the heat substation is mainly composed of a heat network circulating water pump. , exhaust cooler and heat network heater, the exhaust cooler, heat network heater and condenser operate in series, and the heat network circulating water pump has three circulating water pumps driven by back pressure steam turbines for operation 1. One is an electric-driven circulating water pump as a backup, and the heating network heater adopts a horizontal U-shaped tube heater, and the heating network heater and the exhaust steam cooler are heated by extracting steam from a high back pressure steam turbine. The invention utilizes the waste heat recovery technology of high back pressure steam of the steam turbine and the conventional heating system to realize the heat supply capacity, greatly improves the energy utilization efficiency, conforms to the national policy of energy saving and emission reduction and has a great demonstration effect.

Description

technical field [0001] The invention belongs to the field of heating network heating, and relates to a first station of a heating network utilizing waste heat of a coal-fired power plant. Background technique [0002] With the rapid development of urban economic construction and the continuous improvement of people's living standards, the demand for heating load in winter is also growing rapidly. The annual demand for central heating in cities is greater than the actual heating capacity, and the demand for central heating is very urgent. The cold end loss of a thermal power plant is the largest energy loss of the thermal system of the power plant, and a large amount of waste heat of the steam turbine condenser is discharged into the atmosphere through different cooling equipment. When the power plant is operating in winter, the steam turbine exhaust steam condensation heat loss can account for 50-60% of the total fuel calorific value (the thermal power plant is also more tha...

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Problems solved by technology

When the power plant is operating in winter, the steam turbine exhaust steam condensation heat loss can account for 50-60% of the total fuel calorific value (the thermal power plant is also more than 30%), and the steam turbine exhaust steam condensation heat loss is waste heat emission for thermal power plants. But for building heating that requires low-grade heat energy, it constitutes a huge waste of energy and traditional coal-fired power plants, so the existing heating system needs to be transformed, using the high back pressure exhaust steam waste heat recovery technology of the steam turbine and the conventional heating network The first station combined to achieve a heating capacity of 768MW

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